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Platybolium alvearium beetles occur in hives occupied by colonies of Apis cerana in Asia. We quantified beetle abundance in 180 A. cerana and 30 Apis mellifera hives and made behavioral observations in northern Vietnam. Although sometimes common, the beetles were uncommon in A. cerana hives (n = 180) during hive inspections in May/June 2015. In contrast, none were observed in A. mellifera hives. Beetle...